
<p>Appeared in 0.8.3.  Possible values:
</p>
<ul><li> MISS
</li><li> EXPIRED - expired, request was passed to backend
</li><li> UPDATING - expired, stale response was used due to proxy/fastcgi_cache_use_stale updating
</li><li> STALE - expired, stale response was used due to proxy/fastcgi_cache_use_stale
</li><li> HIT
</li></ul>
